<style>
.card-block, .card-footer { margin: 0 auto; }
.card-block img { border-radius: 2px; }
.card-footer { margin-bottom: 2rem; }
</style>
<div class="card">

<div class="embed-responsive embed-responsive-16by9">
  <iframe class="embed-responsive-item" src="http://localhost:8080/druid"></iframe>
</div>
</div>
